AU1661283A - Induction furnace monitor - Google Patents
Induction furnace monitorInfo
- Publication number
- AU1661283A AU1661283A AU16612/83A AU1661283A AU1661283A AU 1661283 A AU1661283 A AU 1661283A AU 16612/83 A AU16612/83 A AU 16612/83A AU 1661283 A AU1661283 A AU 1661283A AU 1661283 A AU1661283 A AU 1661283A
- Authority
- AU
- Australia
- Prior art keywords
- coil
- ground
- transformer
- monitor
- melt bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/22—Furnaces without an endless core
- H05B6/24—Crucible furnaces
- H05B6/28—Protective systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Furnace Details (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- General Induction Heating (AREA)
- Locating Faults (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
Methods of investigation ground faults, particularly on coreless induction furnaces, using a computerised monitor which includes a first potential transformer connected across the coil and second potential transformer connected between one end of the coil and an electric ground. The relative location of a ground fault along the length of the coil is determined by computing the ratio of the transformer outputs. The monitor further includes a first current transformer in the coil power line and a second current transformer with melt bath ground. Internal ground faults are detected by computing the phase difference between the coil and ground currents. A graphic representation of the furnace is also generated to illustrate the location of the ground fault with respect to turns and yokes of the coil. The monitor also calculates liner wear by determining melt bath volume, which is inversely proportional to melt bath resistance, which in turn is proportional to coil resistance. If the furnace being monitored is provided with more than one coil, a differential current transformer is connected across each coil to detect the fault grounded coil when the transformer associated with the faulted coil exhibits a substantially non-zero output.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US405754 | 1982-08-06 | ||
US06/405,754 US4525665A (en) | 1982-08-06 | 1982-08-06 | Induction furnace monitor |
Publications (2)
Publication Number | Publication Date |
---|---|
AU1661283A true AU1661283A (en) | 1984-02-09 |
AU571444B2 AU571444B2 (en) | 1988-04-21 |
Family
ID=23605082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU16612/83A Ceased AU571444B2 (en) | 1982-08-06 | 1983-07-06 | Induction furnace monitor |
Country Status (7)
Country | Link |
---|---|
US (1) | US4525665A (en) |
EP (3) | EP0103394B1 (en) |
JP (1) | JPS5963691A (en) |
AT (1) | ATE22733T1 (en) |
AU (1) | AU571444B2 (en) |
CA (1) | CA1206527A (en) |
DE (1) | DE3366747D1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE460804B (en) * | 1988-03-25 | 1989-11-20 | Asea Brown Boveri | PROCEDURE AND DEVICE FOR MISCELLANEOUS FAULTY ON A POWER CORD |
US4864242A (en) * | 1988-09-06 | 1989-09-05 | Westinghouse Electric Corp. | Automatic field winding ground detector and locator |
DE102006006524B4 (en) * | 2006-02-10 | 2008-11-27 | Saveway Gmbh & Co. Kg | Method for monitoring an induction furnace and induction furnace |
JP2007309907A (en) * | 2006-05-22 | 2007-11-29 | Toyota Industries Corp | Grounding detecting device, and on-vehicle ac-dc conversion device |
US8811450B2 (en) * | 2007-04-10 | 2014-08-19 | Inductotherm Corp. | Integrated process control system for electric induction metal melting furnaces |
US7583073B2 (en) * | 2007-07-19 | 2009-09-01 | Honeywell International Inc. | Core-less current sensor |
US10598439B2 (en) * | 2011-05-23 | 2020-03-24 | Inductotherm Corp. | Electric induction furnace lining wear detection system |
DE102013002795C5 (en) * | 2012-11-09 | 2018-07-19 | Abp Induction Systems Gmbh | Method and device for ground fault detection in an induction furnace and induction furnace |
EP2811248B1 (en) | 2013-06-06 | 2019-05-08 | Siemens Aktiengesellschaft | Insulation monitoring of an electrical heating circuit for a melting furnace and method for monitoring |
GB201522489D0 (en) | 2015-12-21 | 2016-02-03 | Rolls Royce Plc | Electrical fault location method |
IT201800004846A1 (en) * | 2018-04-24 | 2019-10-24 | METHOD OF ELECTRIC POWER SUPPLY OF AN ELECTRIC ARC OVEN AND RELATED APPARATUS |
Family Cites Families (43)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB493892A (en) * | 1937-08-24 | 1938-10-17 | George Donald Lee Horsburgh | Improvements in or relating to electric induction furnaces |
DE840568C (en) * | 1949-10-29 | 1952-06-03 | Hartmann & Braun Ag | Auxiliary converter for transmission ratio meter for power transformers |
US3183294A (en) * | 1962-04-09 | 1965-05-11 | Ohio Crankshaft Co | Temperature control apparatus |
US3331909A (en) * | 1965-03-12 | 1967-07-18 | Ohio Crankshaft Co | Apparatus for energizing an induction melting furnace with a three phase electrical network |
US3478155A (en) * | 1966-07-11 | 1969-11-11 | Ajax Magnethermic Corp | Induction heating |
US3456061A (en) * | 1967-05-22 | 1969-07-15 | Inductotherm Linemelt Corp | Temperature control for electric heating devices |
DE1673601C3 (en) * | 1967-07-01 | 1975-12-18 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | PI controller for a controlled system subject to inertia |
US3588611A (en) * | 1969-10-31 | 1971-06-28 | Westinghouse Electric Corp | Transmission line arc detection and location system |
CA968412A (en) * | 1970-03-13 | 1975-05-27 | Louis Ricard | Dispositif de surveillance de lignes electriques |
ZA703973B (en) * | 1970-06-11 | 1972-01-26 | Patented Devices Ltd | Improvements in or relating to the location of faults in cables |
FR2160306B1 (en) * | 1971-11-19 | 1974-05-10 | Schlumberger Compteurs | |
GB1415504A (en) * | 1972-05-26 | 1975-11-26 | Apv Paralec Ltd | Coreless induction furnace refining and melting apparatus and processes |
US3775676A (en) * | 1972-07-21 | 1973-11-27 | Westinghouse Electric Corp | Methods for locating partial discharges in electrical apparatus |
US3927369A (en) * | 1973-01-31 | 1975-12-16 | Westinghouse Electric Corp | Microwave frequency sensor utilizing a single resonant cavity to provide simultaneous measurements of a plurality of physical properties |
US3821456A (en) * | 1973-09-24 | 1974-06-28 | Ajax Magnethermic Corp | Power control means for a single phase induction melting or heating furnace |
DK64575A (en) * | 1974-02-22 | 1975-10-20 | Innotec Oy | |
US3898366A (en) * | 1974-05-08 | 1975-08-05 | Youngstown Sheet And Tube Co | Metallurgical heating system with refractory wear indicia |
CA1044760A (en) * | 1974-10-09 | 1978-12-19 | Lim C. Hwa | Methods and equipment for testing reflection points of transmission lines |
US4005363A (en) * | 1974-10-22 | 1977-01-25 | The United States Of America As Represented By The Secretary Of The Air Force | Range resolving ground line sensor |
DE2450493A1 (en) * | 1974-10-24 | 1976-04-29 | Aeg Elotherm Gmbh | Induction furnace crucible fullness and erosion monitor - uses relationship between voltage and current in induction coils |
CH608916A5 (en) * | 1975-04-28 | 1979-01-31 | Bbc Brown Boveri & Cie | |
US4037044A (en) * | 1975-08-04 | 1977-07-19 | Ajax Magnethermic Corporation | Power control system for single phase induction melting or heating furnace |
US4090127A (en) * | 1975-09-30 | 1978-05-16 | Augusto Giustini | Device for measuring with direct current the total resistance of a circuit when there is also present an alternative component from the mains |
FR2334116A2 (en) * | 1975-12-03 | 1977-07-01 | Metraplan Spa | METHOD AND DEVICE FOR LOCATING FAULTS IN SAFETY LINES FOR SKI LIFTS |
DE2602615C3 (en) * | 1976-01-24 | 1978-06-15 | Aeg-Elotherm Gmbh, 5630 Remscheid | Method and device for operational monitoring of the crucible wall thickness in electric induction furnaces |
JPS52100149A (en) * | 1976-02-18 | 1977-08-22 | Tokyo Electric Power Co Inc:The | Digital failure point evaluating unit |
US4165482A (en) * | 1976-04-06 | 1979-08-21 | The Electricity Council | Cable fault location |
US4186338A (en) * | 1976-12-16 | 1980-01-29 | Genrad, Inc. | Phase change detection method of and apparatus for current-tracing the location of faults on printed circuit boards and similar systems |
US4139723A (en) * | 1977-04-21 | 1979-02-13 | Ajax Magnethermic Corporation | Power control unit for a single phase load with slightly changing impedances |
CH623963A5 (en) * | 1977-10-28 | 1981-06-30 | Bbc Brown Boveri & Cie | |
JPS54107783A (en) * | 1978-02-13 | 1979-08-23 | Bunjirou Ichijiyou | Device for accurately measuring capacitance of very low impedance by series capacitor system |
JPS54133170A (en) * | 1978-04-05 | 1979-10-16 | Shionogi Seiyaku Kk | Method and device for selectively measuring various electric constants |
US4200836A (en) * | 1978-06-13 | 1980-04-29 | Fuji Electric Co., Ltd. | Apparatus for measuring insulation resistance in an operating three-phase ungrounded transmission line system |
US4241306A (en) * | 1978-08-29 | 1980-12-23 | Bump Russell E | Test fixture having switching means for facilitating transformer turns ratio testing |
US4280038A (en) * | 1978-10-24 | 1981-07-21 | Ajax Magnethermic Corporation | Method and apparatus for inducting heating and melting furnaces to obtain constant power |
JPS5829471B2 (en) * | 1978-10-30 | 1983-06-22 | 東京電力株式会社 | Accident point determination method |
EP0017676B1 (en) * | 1979-03-23 | 1983-01-26 | BBC Aktiengesellschaft Brown, Boveri & Cie. | Method for determining a virtual longitudinal reactance in an electric net |
US4281386A (en) * | 1979-08-01 | 1981-07-28 | Tokyo Shibaura Denki Kabushiki Kaisha | Systems for detecting faults in electric power systems |
US4248625A (en) * | 1979-08-06 | 1981-02-03 | Kawasaki Steel Corporation | Method of operating a blast furnace |
US4269397A (en) * | 1979-08-24 | 1981-05-26 | Bethlehem Steel Corporation | Method for measuring the thickness of a refractory in a metallurgical apparatus |
US4282479A (en) * | 1979-08-24 | 1981-08-04 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Test apparatus for locating shorts during assembly of electrical buses |
US4307267A (en) * | 1980-06-16 | 1981-12-22 | Bell Telephone Laboratories, Incorporated | Testing loaded transmission lines |
US4398232A (en) * | 1981-11-13 | 1983-08-09 | Westinghouse Electric Corp. | Protective relaying methods and apparatus |
-
1982
- 1982-08-06 US US06/405,754 patent/US4525665A/en not_active Expired - Fee Related
-
1983
- 1983-06-30 CA CA000431605A patent/CA1206527A/en not_active Expired
- 1983-07-06 AU AU16612/83A patent/AU571444B2/en not_active Ceased
- 1983-08-04 JP JP58143110A patent/JPS5963691A/en active Pending
- 1983-08-05 EP EP83304560A patent/EP0103394B1/en not_active Expired
- 1983-08-05 DE DE8383304560T patent/DE3366747D1/en not_active Expired
- 1983-08-05 AT AT83304560T patent/ATE22733T1/en not_active IP Right Cessation
- 1983-08-05 EP EP85113589A patent/EP0185887A3/en not_active Withdrawn
- 1983-08-05 EP EP85113588A patent/EP0185886A2/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CA1206527A (en) | 1986-06-24 |
US4525665A (en) | 1985-06-25 |
EP0185887A3 (en) | 1988-02-03 |
AU571444B2 (en) | 1988-04-21 |
JPS5963691A (en) | 1984-04-11 |
DE3366747D1 (en) | 1986-11-13 |
EP0185887A2 (en) | 1986-07-02 |
EP0103394B1 (en) | 1986-10-08 |
EP0103394A1 (en) | 1984-03-21 |
ATE22733T1 (en) | 1986-10-15 |
EP0185886A2 (en) | 1986-07-02 |
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